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758 results on '"Iio, M."'

1. Measurement of the mesonic decay branch of the $\bar{K}\!N\!N$ quasi-bound state

Author

Yamaga, T., Ajimura, S., Asano, H., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Murayama, R., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

We conducted measurements of $K^- + {^3{\rm He}} \to \pi \!Y \!N + N'$ reactions using a $1~{\rm GeV}/c$ $K^-$-beam, with the objective of understanding the broad decay width of $\bar{K} \!N \!N$ (approximately twice as broad as that of $\Lambda(1405)$ considered to be the $\bar{K} \!N$ quasi-bound state). We successfully reproduced distributions of the $\pi \! Y \! N$ invariant mass and momentum transfer for $\pi \! Y \! N$ using model fitting functions for $\bar{K} \!N \!N$ formation and quasi-free $\bar{K}$ absorption (${\rm QF}_{\bar{K}-{\rm abs}}$) processes. The model can describe the experimental data quite well, and four $\bar{K} \! N \! N \to \pi \! Y \! N $ cross-sections were obtained. The results indicate that mesonic decay is the dominant decay branch of $\bar{K} \! N \! N$. The results also suggest that $\Gamma_{\pi \Lambda N} \sim \Gamma_{\pi \Sigma N}$, which indicates that the $I_{\bar{K} \! N}=1$ absorption channel, in addition to the $I_{\bar{K} \! N}=0$ absorption channel, substantially contribute to the $\bar{K} \! N \! N$ decay, making the $\bar{K} \! N \! N$ state approximately twice as unstable as $\Lambda$(1405).

Published
2024

2. Pole position of $\Lambda(1405)$ measured in $d(K^-,n)\pi\Sigma$ reactions

Author

Collaboration, J-PARC E31, Aikawa, S., Ajimura, S., Akaishi, T., Asano, H., Beer, G., Berucci, C., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishimoto, S., Ishikawa, T., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Komatsu, Y., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Murayama, R., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Omar, Z., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokiyasu, A. O., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Vazquez-Doce, O., Widmann, E., Yamaga, T., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We measured a set of $\pi^\pm\Sigma^\mp$, $\pi^0\Sigma^0$, and $\pi^-\Sigma^0$ invariant mass spectra below and above the $\bar{K}N$ mass threshold in $K^-$-induced reactions on deuteron. We deduced the $S$-wave $\bar{K}N\rightarrow\pi\Sigma$ and $\bar{K}N\rightarrow\bar{K}N$ scattering amplitudes in the isospin 0 channel in the framework of a $\bar{K}N$ and $\pi\Sigma$ coupled channel. We find that a resonance pole corresponding to $\Lambda(1405)$ is located at 1417.7$^{+6.0}_{-7.4}$(fitting errors)$^{+1.1}_{-1.0}$(systematic errors) + $[-26.1^{+6.0}_{-7.9}$(fitting errors)$^{+1.7}_{-2.0}$(systematic errors)]$i$ MeV/$c^2$, closer to the $\bar{K}N$ mass threshold than the value determined by the Particle Data Group., Comment: 8 pages, 5 figures

Published
2022
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3. Recent results and future prospects of kaonic nuclei at J-PARC

Author

Sakuma, F., Ajimura, S., Akaishi, T., Asano, H., Bazzi, M., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Clozza, A., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Iwai, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Miliucci, M., Mizoi, Y., Morra, O., Murayama, R., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Ozawa, K., Piscicchia, K., Sada, Y., Sakaguchi, A., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Simon, M., Sirghi, D., Sirghi, F., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vázquez, Widmann, E., Yamaga, T., Yamazaki, T., Yoshida, C., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

$\bar K$-nuclear bound systems, kaonic nuclei, have been widely discussed as products of the strongly attractive $\bar K N$ interaction in $I = 0$ channels. Recently, we demonstrated that kaonic nuclei can be produced via in-flight $(K^-,N)$ reactions using the low-momentum DC kaon beam at the J-PARC E15 experiment. We observed the simplest kaonic nuclei, $K^-pp$, having a much deeper binding energy than normal nuclei. For further studies, we have proposed a series of experimental programs for the systematic investigation of light kaonic nuclei, from $\bar K N$ ($\Lambda(1405)$) to $\bar K NNNN$. In the new experiment approved as J-PARC E80, we will measure the $\bar K NNN$ ($A=3$) system as a first step toward a comprehensive study., Comment: 10 pages, 5 figures, proceedings of the 8th Asia-Pacific Conference on Few-Body Problems in Physics (APFB2020), accepted for publication in Fwe-Body Systems

Published
2021
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4. Observation of a $\bar{K}NN$ bound state in the $^3{\rm He} (K^-, \Lambda p)n$ reaction

Author

Yamaga, T., Ajimura, S., Asano, H., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We have performed an exclusive measurement of the $K^{-}+\! ~^{3}{\rm He} \to \Lambda pn$ reaction at an incident kaon momentum of $1\ {\rm GeV}/c$.In the $\Lambda p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $\bar{K}\!+\!N\!+\!N$, as a signal of the kaonic nuclear bound state, $\bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42\pm3({\rm stat.})^{+3}_{-4}({\rm syst.})\ {\rm MeV}$, $\Gamma_{K} = 100\pm7({\rm stat.})^{+19}_{-9}({\rm syst.})\ {\rm MeV}$, and $Q_{K} = 383\pm11({\rm stat.})^{+4}_{-1}({\rm syst.})\ {\rm MeV}/c$, respectively. The total production cross-section of $\bar{K}NN$, determined by its $\Lambda p$ decay mode, was $\sigma^{tot}_{K} \cdot BR_{\Lambda p} = 9.3\pm0.8({\rm stat.})^{+1.4}_{-1.0}({\rm syst.})\ \mu{\rm b}$.We estimated the branching ratio of the $\bar{K}NN$ state to the $\Lambda p$ and $\Sigma^{0}p$ decay modes as $BR_{\Lambda p}/BR_{\Sigma^{0}p} \sim 1.7$, by assuming that the physical processes leading to the $\Sigma N\!N$ final states are analogous to those of $\Lambda pn$., Comment: 13 pages, 12 figures

Published
2020
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5. J-PARC Neutrino Beamline Upgrade Technical Design Report

Author

Abe, K., Aihara, H., Ajmi, A., Alt, C., Andreopoulos, C., Antonova, M., Aoki, S., Asada, Y., Ashida, Y., Atherton, A., Atkin, E., Ban, S., Barbato, F. C. T., Barbi, M., Barker, G. J., Barr, G., Batkiewicz, M., Beloshapkin, A., Berardi, V., Berns, L., Bhadra, S., Bian, J., Bienstock, S., Blondel, A., Bolognesi, S., Borg, J., Bourguille, B., Boyd, S. B., Brailsford, D., Bravar, A., Bron, S., Bronner, C., Avanzini, M. Buizza, Calabria, N. F., Calcutt, J., Calland, R. G., Calvet, D., Campbell, T., Cao, S., Cartwright, S. L., Catanesi, M. G., Cervera, A., Chappell, A., Cherdack, D., Chikuma, N., Christodoulou, G., Cicerchia, M., Clifton, A., Cogo, G., Coleman, J., Collazuol, G., Coplowe, D., Cudd, A., Dabrowska, A., Delbart, A., De Roeck, A., De Rosa, G., Dealtry, T., Dell'acqua, A., Denner, P. F., Dennis, S. R., Densham, C., Dewhurst, D., Di Lodovico, F., Dolan, S., Dokania, N., Doqua, D., Drapier, O., Duffy, K. E., Dumarchez, J., Dunne, P. J., Dziewiecki, M., Eklund, L., Emery-Schrenk, S., Fedotov, S., Fernandez, P., Feusels, T., Finch, A. J., Fiorentini, G. A., Fiorillo, G., Fitton, M., Friend, M., Fujii, Y., Fujita, R., Fukuda, D., Fukuda, R., Fukuda, Y., Fusshoeller, K., Gendotti, A., Giganti, C., Gizzarelli, F., Gonin, M., Gorin, A., Gramegna, F., Guigue, M., Hadley, D. R., Haigh, J. T., Hallsjö, S. -P., Hamacher-Baumann, P., Hansen, D., Harada, J., Hartz, M., Hasegawa, T., Hastings, N. C., Hayato, Y., Hiramoto, A., Hogan, M., Holeczek, J., Iacob, F., Ichikawa, A. K., Ikeda, M., Imber, J., Ishida, T., Ishii, T., Ishitsuka, M., Iwai, E., Iwamoto, K., Izmaylov, A., Jamieson, B., Jiang, M., Johnson, S., Jonsson, P., Jung, C. K., Kabirnezhad, M., Kaboth, A. C., Kajita, T., Kakuno, H., Kameda, J., Kasetti, S., Kataoka, Y., Katori, T., Kearns, E., Khabibullin, M., Khotjantsev, A., Kikawa, T., Kim, H., King, S., Kisiel, J., Knight, A., Knox, A., Kobayashi, T., Koch, L., Konaka, A., Kormos, L. L., Korzenev, A., Koshio, Y., Kowalik, K., Kropp, W., Kudenko, Y., Kuribayashi, S., Kurjata, R., Kutter, T., Kuze, M., Labarga, L., Lagoda, J., Lamont, I., Lamoureux, M., Last, D., Laveder, M., Lawe, M., Lindner, T., Liptak, Z. J., Litchfield, R. P., Liu, S., Long, K. R., Longhin, A., Lopez, J. P., Ludovici, L., Lu, X., Lux, T., Magaletti, L., Magro, L., Mahn, K., Malek, M., Manly, S., Marchi, T., Maret, L., Marino, A. D., Martin, J. F., Martynenko, S., Maruyama, T., Matsubara, T., Matsushita, K., Matveev, V., Mauger, C., Mavrokoridis, K., Mazzucato, E., McCarthy, M., McCauley, N., McFarland, K. S., McGrew, C., Mefodiev, A., Metelko, C., Mezzetto, M., Mijakowski, P., Mijakowski, J., Minamino, A., Mineev, O., Mine, S., Missert, A., Miura, M., Bueno, L. Molina, Moriyama, S., Morrison, J., Mueller, Th. A., Murphy, S., Nagai, Y., Nakadaira, T., Nakahata, M., Nakajima, Y., Nakamura, A., Nakamura, K. G., Nakamura, K., Nakayama, S., Nakaya, T., Nakayoshi, K., Nantais, C., Ngoc, T. V., Nishikawa, K., Nishimura, Y., Nonnenmacher, T., Nova, F., Novella, P., Nowak, J., Nugent, J. C., O'Keeffe, H. M., Odagawa, T., Ohta, R., Okamoto, K., Okumura, K., Okusawa, T., Ovsyannikova, T., Owen, R. A., Oyama, Y., Palladino, V., Paolone, V., Pari, M., Parker, W., Parsa, S., Pasternak, J., Pastore, C., Pavin, M., Payne, D., Perkin, J. D., Pickard, L., Pickering, L., Guerra, E. S. Pinzon, Popov, B., Posiadala-Zezula, M., Poutissou, J. -M., Poutissou, R., Pozimski, J., Przewlocki, P., Przybilsk, H., Quilain, B., Radermacher, T., Radicioni, E., Radics, B., Ratoff, P. N., Reinherz-Aronis, E., Riccio, C., Rojas, P., Rondio, E., Rossi, B., Roth, S., Rubbia, A., Ruggeri, A. C., Ruggles, C. A., Rychter, A., Sakashita, K., Sánchez, F., Schloesser, C. M., Scholberg, K., Schwehr, J., Scott, M., Seiya, Y., Sekiguchi, T., Sekiya, H., Sgalaberna, D., Shaikina, A., Shah, R., Shaikhiev, A., Shaker, F., Shaw, D., Shiozawa, M., Shirahige, T., Shorrock, W., Smirnov, A., Smy, M., Sobczyk, J. T., Sobel, H., Soler, F. J. P., Southwell, L., Spina, R., Steinmann, J., Stewart, T., Stowell, P., Suvorov, S., Suzuki, A., Suzuki, S. Y., Suzuki, Y., Swierblewski, J., Szeptycka, M., Szoldos, S., Sztuc, A., Tacik, R., Tada, M., Tajima, M., Takeda, A., Takeuchi, Y., Tanaka, H. K., Tanaka, H. A., Thompson, L. F., Toki, W., Tomura, T., Touramanis, C., Tsui, K., Tsukamoto, T., Tzanov, M., Uchida, M. A., Uchida, Y., Vagins, M., Van, N. H., Vasseur, G., Viant, T., Vilela, C., Wachala, T., Walter, C. W., Wang, Y., Wark, D., Wascko, M. O., Weber, A., Wendell, R., Wilkes, R. J., Wilking, M. J., Wilson, J. R., Wilson, R. J., Wood, K., Wret, C., Yamada, Y., Yamamoto, K., Yanagisawa, C., Yang, G., Yano, T., Yasutome, K., Yen, S., Yershov, N., Yokoyama, M., Yoshida, T., Yuan, T., Yu, M., Zalewska, A., Zalipska, J., Zambelli, L., Zaremba, K., Ziembicki, M., Zimmerman, E. D., Zito, M., Hamada, E., Higashi, N., Hirose, E., Igarashi, Y., Iida, M., Iio, M., Ikeno, M., Kimura, N., Kurosawa, N., Makida, Y., Nakamoto, T., Ogitsu, T., Ohhata, H., Okada, R., Okamura, T., Onaka, M., Sasaki, K., Shimazaki, S., Shoji, M., Sugano, M., Tanaka, K., Tanaka, M., Terashima, A., Tomaru, T., Uchida, T., and Yoshida, M.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

In this document, technical details of the upgrade plan of the J-PARC neutrino beamline for the extension of the T2K experiment are described. T2K has proposed to accumulate data corresponding to $2\times{}10^{22}$ protons-on-target in the next decade, aiming at an initial observation of CP violation with $3\sigma$ or higher significance in the case of maximal CP violation. Methods to increase the neutrino beam intensity, which are necessary to achieve the proposed data increase, are described.

Published
2019

6. COMET Phase-I Technical Design Report

Author

The COMET Collaboration, Abramishvili, R., Adamov, G., Akhmetshin, R. R., Allin, A., Angélique, J. C., Anishchik, V., Aoki, M., Aznabayev, D., Bagaturia, I., Ban, G., Ban, Y., Bauer, D., Baygarashev, D., Bondar, A. E., Cârloganu, C., Carniol, B., Chau, T. T., Chen, J. K., Chen, S. J., Cheung, Y. E., da Silva, W., Dauncey, P. D., Densham, C., Devidze, G., Dornan, P., Drutskoy, A., Duginov, V., Eguchi, Y., Epshteyn, L. B., Evtoukhovich, P., Fayer, S., Fedotovich, G. V., Finger Jr, M., Finger, M., Fujii, Y., Fukao, Y., Gabriel, J. L., Gay, P., Gillies, E., Grigoriev, D. N., Gritsay, K., Hai, V. H., Hamada, E., Hashim, I. H., Hashimoto, S., Hayashi, O., Hayashi, T., Hiasa, T., Ibrahim, Z. A., Igarashi, Y., Ignatov, F. V., Iio, M., Ishibashi, K., Issadykov, A., Itahashi, T., Jansen, A., Jiang, X. S., Jonsson, P., Kachelhoffer, T., Kalinnikov, V., Kaneva, E., Kapusta, F., Katayama, H., Kawagoe, K., Kawashima, R., Kazak, N., Kazanin, V. F., Kemularia, O., Khvedelidze, A., Koike, M., Kormoll, T., Kozlov, G. A., Kozyrev, A. N., Kravchenko, M., Krikler, B., Kumsiashvili, G., Kuno, Y., Kuriyama, Y., Kurochkin, Y., Kurup, A., Lagrange, B., Lai, J., Lee, M. J., Li, H. B., Litchfield, R. P., Li, W. G., Loan, T., Lomidze, D., Lomidze, I., Loveridge, P., Macharashvili, G., Makida, Y., Mao, Y. J., Markin, O., Matsuda, Y., Melkadze, A., Melnik, A., Mibe, T., Mihara, S., Miyamoto, N., Miyazaki, Y., Idris, F. Mohamad, Azmi, K. A. Mohamed Kamal, Moiseenko, A., Moritsu, M., Mori, Y., Motoishi, T., Nakai, H., Nakai, Y., Nakamoto, T., Nakamura, Y., Nakatsugawa, Y., Nakazawa, Y., Nash, J., Natori, H., Niess, V., Nioradze, M., Nishiguchi, H., Noguchi, K., Numao, T., O'Dell, J., Ogitsu, T., Ohta, S., Oishi, K., Okamoto, K., Okamura, T., Okinaka, K., Omori, C., Ota, T., Pasternak, J., Paulau, A., Picters, D., Ponariadov, V., Quémener, G., Ruban, A. A., Rusinov, V., Sabirov, B., Sakamoto, H., Sarin, P., Sasaki, K., Sato, A., Sato, J., Semertzidis, Y. K., Shigyo, N., Shoukavy, Dz., Slunecka, M., Stöckinger, D., Sugano, M., Tachimoto, T., Takayanagi, T., Tanaka, M., Tang, J., Tao, C. V., Teixeira, A. M., Tevzadze, Y., Thanh, T., Tojo, J., Tolmachev, S. S., Tomasek, M., Tomizawa, M., Toriashvili, T., Trang, H., Trekov, I., Tsamalaidze, Z., Tsverava, N., Uchida, T., Uchida, Y., Ueno, K., Velicheva, E., Volkov, A., Vrba, V., Abdullah, W. A. T. Wan, Warin-Charpentier, P., Wong, M. L., Wong, T. S., Wu, C., Xing, T. Y., Yamaguchi, H., Yamamoto, A., Yamanaka, M., Yamane, T., Yang, Y., Yano, T., Yao, W. C., Yeo, B., Yoshida, H., Yoshida, M., Yoshioka, T., Yuan, Y., Yudin, Yu. V., Zdorovets, M. V., Zhang, J., Zhang, Y., and Zuber, K.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

The Technical Design for the COMET Phase-I experiment is presented in this paper. COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of an aluminium nucleus ($\mu-e$ conversion, $\mu^- N \to e^- N$); a lepton flavor violating process. The experimental sensitivity goal for this process in the Phase-I experiment is $3.1\times10^{-15}$, or 90 % upper limit of branching ratio of $7\times 10^{-15}$, which is a factor of 100 improvement over the existing limit. The expected number of background events is 0.032. To achieve the target sensitivity and background level, the 3.2 kW 8 GeV proton beam from J-PARC will be used. Two types of detectors, CyDet and StrECAL, will be used for detecting the \mue conversion events, and for measuring the beam-related background events in view of the Phase-II experiment, respectively. Results from simulation on signal and background estimations are also described., Comment: A minor correction applied in Eq. 3

Published
2018
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7. '$\mathbf{{\textit K^-}{\textit p}{\textit p}}$', a ${\overline{K}}$-Meson Nuclear Bound State, Observed in $^{3}{\rm He}({K^-}, {\Lambda} p)n$ Reactions

Author

collaboration, J-PARC E15, Ajimura, S., Asano, H., Beer, G., Berucci, C., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamaga, T., Yamazaki, T., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We observed a distinct peak in the $\Lambda p$ invariant mass spectrum of $^{3}{\rm He}(K^-, \, \Lambda p)n$, well below the mass threshold of $m_K + 2 m_p$. By selecting a relatively large momentum-transfer region $q = 350 \sim 650$ MeV/$c$, one can clearly separate the peak from the quasi-free process, $\overline{K}N \rightarrow \overline{K}N$ followed by the non-resonant absorption by the two spectator-nucleons $\overline{K}NN \rightarrow \Lambda N $. We found that the simplest fit to the observed peak gives us a Breit-Wigner pole position at $B_{\rm {\it Kpp}} = 47 \pm 3 \, (stat.) \,^{+3}_{-6} \,(sys.)$ MeV having a width $\Gamma_{\rm {\it Kpp}} = 115 \pm 7 \, (stat.) \,^{+10}_{-9} \,(sys.)$ MeV, and the $S$-wave Gaussian reaction form-factor parameter $Q_{\rm {\it Kpp}} = 381 \pm 14 \, (stat.)\,^{+57}_{-0} \,(sys.)$ MeV/$c$, as a new form of the nuclear bound system with strangeness -- "$K^-pp$"., Comment: 17 pages, 4 figures

Published
2018

8. Structure near $K^-$+$p$+$p$ threshold in the in-flight $^3$He$(K^-,\Lambda p)n$ reaction

Author

Collaboration, J-PARC E15, Sada, Y., Ajimura, S., Bazzi, M., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Faso, D., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Vidal, A. Romero, Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Wuenschek, B. K., Yamaga, T., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

To search for an S= -1 di-baryonic state which decays to $\Lambda p$, the $ {\rm{}^3He}(K^-,\Lambda p)n_{missing}$ reaction was studied at 1.0 GeV/$c$. Unobserved neutrons were kinematically identified from the missing mass $M_X$ of the $ {\rm{}^3He}(K^-,\Lambda p)X$ reaction in order to have a large acceptance for the $\Lambda pn$ final state. The observed $\Lambda p n$ events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the $\Lambda p$. To account for the observed peak structure, the simplest S-wave pole was assumed to exist in the reaction channel, having Breit-Wigner form in energy and with a Gaussian form-factor. A minimum $\chi^2$ method was applied to deduce its mass $M_X\ =$ 2355 $ ^{+ 6}_{ - 8}$ (stat.) $ \pm 12$ (syst.) MeV/c$^2$, and decay-width $\Gamma_X\ = $ 110 $ ^{+ 19}_{ - 17}$ (stat.) $ \pm 27$ (syst.) MeV/c$^2$, respectively. The form factor parameter $Q_X \sim$ 400 MeV/$c$ implies that the range of interaction is about 0.5, Comment: 12pages, 8 figures

Published
2016
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9. Magnetic Field Measurement of Superconducting Transport Solenoid for COMET

Author

Arimoto, Y., Aoki, K., Ohuchi, N., Sumi, N., Yoshida, M., Sasaki, K., Iio, M., Makida, Y., and Mihara, S.

Abstract

The COMET experiment, currently under construction at J-PARC, aims to explore the process of muon-to-electron conversion in a nucleus. This phenomenon, known as charged-lepton flavor violation, is an elementary process beyond the Standard Model. The muon beam is produced from pion decays generated by bombarding a proton beam on a target and corrected and transported from the production target to a stopping target in a detector with superconducting solenoid magnets. Their momentum is selected by a curved solenoid field (3 T) and dipole field (0.05 T) in the Muon Transport Solenoid (MTS), which has a diameter of 468 mm and a curvature radius of 3 m with a bending angle of 90 degrees. We energized the solenoid up to 105 A and the dipole to $\pm$175 A in the summer of 2022. Although the solenoid was operated at a half of its design value (210 A) due to the limitation of the support structure, this commissioning provided a sufficient current for the subsequent engineering beam operation (Phase-$\alpha$) to be conducted successfully. We performed in-situ magnetic measurements of the curved solenoid with Hall probes and compared them to 3D calculations. The paper describes the scheme and results of the magnetic filed measurement in MTS.

Published
2024
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10. Measurement of the strong interaction induced shift and width of the 1s state of kaonic deuterium at J-PARC

Author

Zmeskal, J., Sato, M., Ajimura, S., Bazzi, M., Beer, G., Berucci, C., Bhang, H., Bosnar, D., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Clozza, A., Curceanu, C., D'uffizi, A., Enomoto, S., Fabbietti, L., Faso, D., Fiorini, C., Fujioka, H., Ghio, F., Golser, R., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kawasaki, S., Lachner, J., Sandri, P. Levi, Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Moskal, P., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Pietreanu, D., Piscicchia, K., Lener, M. Poli, Vidal, A. Romero, Sada, Y., Sakaguchi, A., Sakuma, F., Sbardella, E., Scordo, A., Sekimoto, M., Shi, H., Silarski, M., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Toyoda, A., Tucakovic, I., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamaga, T., Yamazaki, T., and Zhang, Q.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The antikaon-nucleon interaction close to threshold provides crucial information on the interplay between spontaneous and explicit chiral symmetry breaking in low-energy QCD. In this context the importance of kaonic deuterium X-ray spectroscopy has been well recognized, but no experimental results have yet been obtained due to the difficulty of the measurement. We propose to measure the shift and width of the kaonic deuterium 1s state with an accuracy of 60 eV and 140 eV respectively at J-PARC. These results together with the kaonic hydrogen data (KpX at KEK, DEAR and SIDDHARTA at DAFNE) will then permit the determination of values of both the isospin I=0 and I=1 antikaon-nucleon scattering lengths and will provide the most stringent constraints on the antikaon-nucleon interaction, promising a breakthrough. Refined Monte Carlo studies were performed, including the investigation of background suppression factors for the described setup. These studies have demonstrated the feasibility of determining the shift and width of the kaonic deuterium atom 1s state with the desired accuracy of 60 eV and 140 eV., Comment: 12 pages, 9 figures

Published
2015
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12. Development of liquid helium-3 target for experimental studies of antikaon-nucleon interaction at J-PARC

Author

Iio, M., Ishimoto, S., Sato, M., Enomoto, S., Hashimoto, T., Suzuki, S., Iwasaki, M., and Hayano, R. S.

Subjects
Physics - Instrumentation and Detectors
Abstract

A liquid helium-3 target system was developed for experimental studies of kaonic atoms and kaonic nuclei at J-PARC. helium-3 gas is liquefied in a heat exchanger cooled below 3.2 K by decompression of liquid helium-4. To maintain a large acceptance of the cylindrical detector system for decay particles of kaonic nuclei, efficient heat transport between the separate target cell and the main unit is realized using circulation of liquid helium-3. To minimize the amount of material, a vacuum vessel containing a carbon fiber reinforced plastic cylinder having an inside diameter of 150 mm and a thickness of 1 mm was produced. A target cell made of pure beryllium and beryllium-aluminum alloy was developed not only to minimize the amount of material but to obtain also high x-ray transmission. During a cooling test, the target cell was kept at 1.3 K at a pressure of 33 mbar. The total estimated heat load to the components including the target cell and heat exchanger cooled by liquid helium-4 decompression, was 0.21 W, and the liquid helium-4 consumption rate was 50 L/day., Comment: 14 pages, 9 figures, submitted to Nuclear Instruments and Methods in Physics Research Section A

Published
2012
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13. Temperature dependencies of the energy and time resolution of silicon drift detectors

Author

Wuenschek, B. K., Fujiwara, Y., Hashimoto, T., Hayano, R. S., Iio, M., Ishimoto, S., Ishiwatari, T., Sato, M., Widmann, E., and Zmeskal, J.

Subjects
Physics - Instrumentation and Detectors
Abstract

The response of silicon drift detectors (SDDs), which were mounted together with their preamplifiers inside a vacuum chamber, was studied in a temperature range from 100 K to 200 K. In particular, the energy resolution could be stabilized to about 150 eV at 6 keV between 130 K and 200 K, while the time resolution shows a temperature dependence of T^3 in this temperature range. To keep a variation of the X-ray peak positions within 1 eV, it is necessary to operate the preamplifier within a stability of 1 K around 280 K. A detailed investigation of this temperature influences on SDDs and preamplifiers is presented.

Published
2011

14. Three- and four-nucleon absorption processes observed in the $K^-$-$^4$He reaction at rest

Author

Suzuki, T., Bhang, H., Chiba, J., Choi, S., Fukuda, Y., Hanaki, T., Hayano, R. S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kienle, P., Kim, J. H., Matsuda, Y., Ohnishi, H., Okada, S., Outa, H., Sato, M., Suzuki, S., Tomono, D., Widmann, E., Yamazaki, T., and Yim, H.

Subjects
Nuclear Experiment
Abstract

Correlations of back-to-back coincident $\Lambda d$ and $\Lambda t$ pairs from the stopped $K^-$ reaction on $^4$He had been investigated, thereby $\Lambda d$ and $\Lambda t$ branches of non-mesonic three- and four-nucleon absorption processes of antikaon at rest were identified as well-separable processes, respectively. The branching ratio of the three-nucleon process, ($^4$He-$K^-$)$_{atomic} \rightarrow \Lambda d "n"$, is estimated to be $(0.9 \pm 0.1 (stat) \pm 0.2 (syst)) \times 10^{-3}$ from the normalized $\Lambda d$ spectrum in a $\Lambda d n$ final state, while the fraction of the four-nucleon process, ($^4$He-$K^-$)$_{atomic} \rightarrow \Lambda t$, is obtained to be $(3.1 \pm 0.4 (stat) \pm 0.5 (syst)) \times 10^{-4}$ per stopped $K^-$., Comment: 6 pages, 4 figures, to be submitted to Physics Letters B

Published
2010

15. $\Lambda N$ correlations from the stopped $K^-$ reaction on ${}^4$He

Author

Suzuki, T., Bhang, H., Chiba, J., Choi, S., Fukuda, Y., Hanaki, T., Hayano, R. S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kienle, P., Kim, J. H., Matsuda, Y., Ohnishi, H., Okada, S., Outa, H., Sato, M., Suzuki, S., Tomono, D., Widmann, E., Yamazaki, T., and Yim, H.

Subjects
Nuclear Experiment
Abstract

We have investigated correlations of coincident $\Lambda N$ pairs from the stopped $K^-$ reaction on ${}^4$He, and clearly observed $\Lambda p$ and $\Lambda n$ branches of the two-nucleon absorption process in the $\Lambda N$ invariant mass spectra. In addition, non-mesonic reaction channels, which indicate possible exotic signals for the formation of strange multibaryon states, have been identified., Comment: 5 pages, 3 figures, submitted to Physical Review Letters

Published
2007
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16. $\Lambda d$ correlations from the $^4$He(stopped-$K^-$,$d$) reaction

Author

Suzuki, T., Bhang, H., Chiba, J., Choi, S., Fukuda, Y., Hanaki, T., Hayano, R. S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kienle, P., Kim, J. H., Matsuda, Y., Ohnishi, H., Okada, S., Outa, H., Sato, M., Suzuki, S., Tomono, D., Widmann, E., Yamazaki, T., and Yim, H.

Subjects
Nuclear Experiment
Abstract

We have observed an intense high-energy component in an inclusive $^4$He(stopped $K^-$, $d$) spectrum. For back-to-back $\Lambda d$ pairs a prominent event cluster has been found just below the $m_{^4\textrm{He}}+m_{K^-}-m_{n}$ mass threshold in the $\Lambda d$ invariant mass spectrum of $\Lambda dn$ events, which is evidence for a three-nucleon absorption process of $K^-$ in $^4$He. In addition, an appreciable strength is revealed below $\sim$3220 MeV/$c^2$. Well separated $\Sigma^0 dn$ events show a peak similar to the case of $\Lambda dn$., Comment: 4 pages, 4 figures, published in Physical Review C as a Brief Report

Published
2007
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17. Search for strange tribaryon states in the inclusive ^4He(K^{-}_{stopped}, p) reaction

Author

Sato, M., Bhang, H., Chiba, J., Choi, Seonho, Fukuda, Y., Hanaki, T., Hayano, R. S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kienle, P., Kim, J. H., Matsuda, Y., Ohnishi, H., Okada, S., Outa, H., Suzuki, S., Suzuki, T., Tomono, D., Widmann, E., Yamazaki, T., and Yim, H.

Subjects
Nuclear Experiment
Abstract

A search for tribaryon states was performed at KEK-PS. We adopted the $^4$He($K^-_{stopped}, p)$ reaction to populate the states with strangeness -1, charge 0 and isospin 1. No significant narrow structure was observed in the mass region from 3000 to 3200 MeV/c^2 in an inclusive missing mass spectrum. The upper limit of the formation branching ratio was determined to be ($1\sim3)\times 10^{-4}$, ($0.7\sim2)\times 10^{-3}$ and ($2\sim8) \times 10^{-3}$/($stopped K^{-}$) with 95 % confidence level for narrow states with an assumed width of 0, 20 and 40 MeV/c^2, respectively., Comment: 11 pages, 6 figures, submitted to Physics Letters B

Published
2007
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18. Precision measurement of the $3d \to 2p$ x-ray energy in kaonic $^4$He

Author

Okada, S., Beer, G., Bhang, H., Cargnelli, M., Chiba, J., Choi, Seonho, Curceanu, C., Fukuda, Y., Hanaki, T., Hayano, R. S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Juhász, B., Kienle, P., Marton, J., Matsuda, Y., Ohnishi, H., Outa, H., Sato, M., Schmid, P., Suzuki, S., Suzuki, T., Tatsuno, H., Tomono, D., Widmann, E., Yamazaki, T., Yim, H., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We have measured the Balmer-series x-rays of kaonic $^4$He atoms using novel large-area silicon drift x-ray detectors in order to study the low-energy $\bar{K}$-nucleus strong interaction. The energy of the $3d \to 2p$ transition was determined to be 6467 $\pm$ 3 (stat) $\pm$ 2 (syst) eV. The resulting strong-interaction energy-level shift is in agreement with theoretical calculations, thus eliminating a long-standing discrepancy between theory and experiment., Comment: 12 pages, 4 figues, submitted to Physics Letters B

Published
2007
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19. Search for a kaonic nuclear state via $^4$He$(K^-, N)$

Author

Iwasaki, M., Bhang, H., Chiba, J., Choi, S., Fukuda, Y., Hanaki, T., Hayano, R. S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Kienle, P., Kim, J. H., Matsuda, Y., Ohnishi, H., Okada, S., Outa, H., Sato, M., Suzuki, S., Suzuki, T., Tomono, D., Widmann, E., Yamazaki, T., and Yim, H.

Subjects
Nuclear Experiment
Abstract

Very recently, we have performed a couple of experiments, {\it{KEK PS-E549/E570}}, for the detailed study of the strange tribaryon $S^0(3115)$ obtained in {\it{KEK PS-E471}}. These experiments were performed to accumulate much higher statistics with improved experimental apparatusespecially for the better proton spectroscopy of the $^4$He({\it{stopped K}}$^-$, {\it{N}}) reaction. In contrast to the previous proton spectrum, no narrow ($\sim$ 20 MeV) peak structure was found either in the inclusive $^4$He({\it{stopped K}}$^-$, {\it{p}}) or in the semi-inclusive $^4$He({\it{stopped K}}$^-$, {\it{p}}$X^\pm$) reaction channel, which is equivalent to the previous $E471$ event trigger condition. Detailed analysis of the present data and simulation shows that the peak, corresponding to $S^0(3115)$, has been an experimental artifact. Present analysis does not exclude the possible existence of a much wider structure. To be sensitive to such structure and for better understanding of the non-mesonic $K^-$ absorption reaction channel, detailed analysis of the data is in progress., Comment: 6 pages, 8 figures, conference HYP07 at Maintz

Published
2007

20. Pole position of Λ(1405) measured in d(K−,n)πΣ reactions

Author

Aikawa, S., primary, Ajimura, S., additional, Akaishi, T., additional, Asano, H., additional, Beer, G., additional, Berucci, C., additional, Bragadireanu, M., additional, Buehler, P., additional, Busso, L., additional, Cargnelli, M., additional, Choi, S., additional, Curceanu, C., additional, Enomoto, S., additional, Fujioka, H., additional, Fujiwara, Y., additional, Fukuda, T., additional, Guaraldo, C., additional, Hashimoto, T., additional, Hayano, R.S., additional, Hiraiwa, T., additional, Iio, M., additional, Iliescu, M., additional, Inoue, K., additional, Ishiguro, Y., additional, Ishimoto, S., additional, Ishikawa, T., additional, Itahashi, K., additional, Iwai, M., additional, Iwasaki, M., additional, Kanno, K., additional, Kato, K., additional, Kato, Y., additional, Kawasaki, S., additional, Kienle, P., additional, Komatsu, Y., additional, Kou, H., additional, Ma, Y., additional, Marton, J., additional, Matsuda, Y., additional, Mizoi, Y., additional, Morra, O., additional, Murayama, R., additional, Nagae, T., additional, Noumi, H., additional, Ohnishi, H., additional, Okada, S., additional, Omar, Z., additional, Outa, H., additional, Piscicchia, K., additional, Sada, Y., additional, Sakaguchi, A., additional, Sakuma, F., additional, Sato, M., additional, Scordo, A., additional, Sekimoto, M., additional, Shi, H., additional, Shirotori, K., additional, Sirghi, D., additional, Sirghi, F., additional, Suzuki, K., additional, Suzuki, S., additional, Suzuki, T., additional, Tanida, K., additional, Tatsuno, H., additional, Tokiyasu, A.O., additional, Tokuda, M., additional, Tomono, D., additional, Toyoda, A., additional, Tsukada, K., additional, Vazquez-Doce, O., additional, Widmann, E., additional, Yamaga, T., additional, Yamazaki, T., additional, Yim, H., additional, Zhang, Q., additional, and Zmeskal, J., additional

Published
2023
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21. Search for a kaonic nuclear state via 4He(K−, N) reaction at rest

Author

Iwasaki, M., Bhang, H., Chiba, J., Choi, S., Fukuda, Y., Hanaki, T., Hayano, R. S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Kienle, P., Kim, J. H., Matsuda, Y., Ohnishi, H., Okada, S., Outa, H., Sato, M., Suzuki, S., Suzuki, T., Tomono, D., Widmann, E., Yamazaki, T., Yim, H., Pochodzalla, Josef, editor, and Walcher, Thomas, editor

Published
2007
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22. Precision spectroscopy of kaonic helium-4 X-rays

Author

Hayano, R. S., Beer, G., Bhang, H., Cargnelli, M., Chiba, J., Choi, S., Curceanu, C., Fukuda, Y., Hanaki, T., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Juhász, B., Kienle, P., Marton, J., Matsuda, Y., Ohnishi, H., Okada, S., Outa, H., Sato, M., Schmid, P., Suzuki, S., Suzuki, T., Tatsuno, H., Tomono, D., Widmann, E., Yamazaki, T., Yim, H., Zmeskal, J., Pochodzalla, Josef, editor, and Walcher, Thomas, editor

Published
2007
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23. Experimental search of strange tribaryons in the 4He(Kstop −, n) reaction

Author

Yim, H., Bhang, H., Chiba, J., Choi, S., Fukuda, Y., Hanaki, T., Hayano, R. S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kienle, P., Kim, J. H., Matsuda, Y., Ohnishi, H., Okada, S., Outa, H., Sato, M., Suzuki, S., Suzuki, T., Tomono, D., Widmann, E., Yamazaki, T., Pochodzalla, Josef, editor, and Walcher, Thomas, editor

Published
2007
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24. A search for deeply-bound kaonic nuclear state at the J-PARC E15 experiment

Author

Ajimura, S., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Faso, D., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R.S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Poli Lener, M., Romero Vidal, A., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Vazquez Doce, O., Widmann, E., Yamazaki, T., Yim, H., and Zmeskal, J.

Published
2013
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26. Pole position of $Λ(1405)$ measured in $d(K^-,n)πΣ$ reactions

Author

PARC E31 Collaboration, Aikawa, S., Ajimura, S., Akaishi, T., Asano, H., Beer, G., Berucci, C., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishimoto, S., Ishikawa, T., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Komatsu, Y., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Murayama, R., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Omar, Z., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokiyasu, A. O., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Vazquez-Doce, O., Widmann, E., Yamaga, T., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

We measured a set of $π^\pmΣ^\mp$, $π^0Σ^0$, and $π^-Σ^0$ invariant mass spectra below and above the $\bar{K}N$ mass threshold in $K^-$-induced reactions on deuteron. We deduced the $S$-wave $\bar{K}N\rightarrowπΣ$ and $\bar{K}N\rightarrow\bar{K}N$ scattering amplitudes in the isospin 0 channel in the framework of a $\bar{K}N$ and $πΣ$ coupled channel. We find that a resonance pole corresponding to $Λ(1405)$ is located at 1417.7$^{+6.0}_{-7.4}$(fitting errors)$^{+1.1}_{-1.0}$(systematic errors) + $[-26.1^{+6.0}_{-7.9}$(fitting errors)$^{+1.7}_{-2.0}$(systematic errors)]$i$ MeV/$c^2$, closer to the $\bar{K}N$ mass threshold than the value determined by the Particle Data Group., 8 pages, 5 figures

Published
2022
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28. Recent Results and Future Prospects of Kaonic Nuclei at J-PARC

Author

Sakuma, F., primary, Ajimura, S., additional, Akaishi, T., additional, Asano, H., additional, Bazzi, M., additional, Beer, G., additional, Bhang, H., additional, Bragadireanu, M., additional, Buehler, P., additional, Busso, L., additional, Cargnelli, M., additional, Choi, S., additional, Clozza, A., additional, Curceanu, C., additional, Enomoto, S., additional, Fujioka, H., additional, Fujiwara, Y., additional, Fukuda, T., additional, Guaraldo, C., additional, Hashimoto, T., additional, Hayano, R. S., additional, Hiraiwa, T., additional, Iio, M., additional, Iliescu, M., additional, Inoue, K., additional, Ishiguro, Y., additional, Ishikawa, T., additional, Ishimoto, S., additional, Itahashi, K., additional, Iwasaki, M., additional, Iwai, M., additional, Kanno, K., additional, Kato, K., additional, Kato, Y., additional, Kawasaki, S., additional, Kienle, P., additional, Kou, H., additional, Ma, Y., additional, Marton, J., additional, Matsuda, Y., additional, Miliucci, M., additional, Mizoi, Y., additional, Morra, O., additional, Murayama, R., additional, Nagae, T., additional, Noumi, H., additional, Ohnishi, H., additional, Okada, S., additional, Outa, H., additional, Ozawa, K., additional, Piscicchia, K., additional, Sada, Y., additional, Sakaguchi, A., additional, Sato, M., additional, Scordo, A., additional, Sekimoto, M., additional, Shi, H., additional, Shirotori, K., additional, Simon, M., additional, Sirghi, D., additional, Sirghi, F., additional, Suzuki, S., additional, Suzuki, T., additional, Tanida, K., additional, Tatsuno, H., additional, Tokuda, M., additional, Tomono, D., additional, Toyoda, A., additional, Tsukada, K., additional, Doce, O. Vázquez, additional, Widmann, E., additional, Yamaga, T., additional, Yamazaki, T., additional, Yoshida, C., additional, Zhang, Q., additional, and Zmeskal, J., additional

Published
2021
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31. A Search for Deeply Bound Kaonic Nuclear States at J-PARC

Author

Ajimura, S., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Faso, D., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Lener, M. Poli, Vidal, A. Romero, Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamazaki, T., Yim, H., and Zmeskal, J.

Published
2013
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33. Indirectly cooled radiation-resistant magnets for Hadron target station at J-PARC

Author

Takahashi, H., Agari, K., Hirose, E., Ieiri, M., Iio, M., Katoh, Y., Kiyomichi, A., Minakawa, M., Muto, R., Naruki, M., Noumi, H., Sato, Y., Sawada, S., Shirakabe, Y., Suzuki, Y., Takasaki, M., Tanaka, K.H., Toyoda, A., Watanabe, H., Yamanoi, Y., Ogata, K., Saijyo, M., Saitoh, Y., Katoh, K., and Yahata, K.

Subjects
Electric coils -- Usage, Particle accelerators -- Design and construction, Protons -- Research, Superconducting magnets -- Design and construction, Superconducting magnets -- Heating, cooling and ventilation, Business, Electronics, Electronics and electrical industries
Published
2010

34. Radiation-resistant magnets for Hadron experimental hall of J-PARC

Author

Tanaka, K.H., Hirose, E., Takahashi, H., Agari, K., Ieiri, M., Katoh, Y., Kiyomichi, A., Minakawa, M., Muto, R., Naruki, M., Noumi, H., Sato, Y., Sawada, S., Suzuki, Y., Takasaki, M., Toyoda, A., Watanabe, H., Yamanoi, Y., Iio, M., Kato, K., Ozawa, T., Saijyo, M., Saitoh, Y., Satoh, H., Yahata, K., and Birumachi, T.

Subjects
Materials handling -- Methods, Neutron beams -- Research, Protons -- Research, Superconducting magnets -- Design and construction, Technical institutes -- Research, Business, Electronics, Electronics and electrical industries
Published
2010

35. Development of indirect-cooling radiation-resistant magnets

Author

Takahashi, H., Agari, K., Hirose, E., Ieiri, M., Iio, M., Katoh, Y., Minakawa, M., Muto, R., Naruki, M., Noumi, H., Sato, Y., Sawada, S., Suzuki, Y., Takasaki, M., Tanaka, K.H., Toyoda, A., Watanabe, H., Yamanoi, Y., Saijo, M., Saitoh, Y., Katoh, K., and Yahata, K.

Subjects
Ion bombardment -- Usage, Magnetic fields -- Analysis, Proton beams -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

Indirect-cooling mineral-insulation magnet coils are developed for high radiation environment downstream of a production target. The current of DC 1000 A is fed to the solid-conductor mineral-insulator-cable (MIC) coils in vacuum by improving the structure of end parts of MICs and by increasing their emissivity.

Published
2008

36. Observation of a $\bar{K}NN$ bound state in the $^3{\rm He} (K^-, ��p)n$ reaction

Author

Yamaga, T., Ajimura, S., Asano, H., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We have performed an exclusive measurement of the $K^{-}+\! ~^{3}{\rm He} \to ��pn$ reaction at an incident kaon momentum of $1\ {\rm GeV}/c$.In the $��p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $\bar{K}\!+\!N\!+\!N$, as a signal of the kaonic nuclear bound state, $\bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42\pm3({\rm stat.})^{+3}_{-4}({\rm syst.})\ {\rm MeV}$, $��_{K} = 100\pm7({\rm stat.})^{+19}_{-9}({\rm syst.})\ {\rm MeV}$, and $Q_{K} = 383\pm11({\rm stat.})^{+4}_{-1}({\rm syst.})\ {\rm MeV}/c$, respectively. The total production cross-section of $\bar{K}NN$, determined by its $��p$ decay mode, was $��^{tot}_{K} \cdot BR_{��p} = 9.3\pm0.8({\rm stat.})^{+1.4}_{-1.0}({\rm syst.})\ ��{\rm b}$.We estimated the branching ratio of the $\bar{K}NN$ state to the $��p$ and $��^{0}p$ decay modes as $BR_{��p}/BR_{��^{0}p} \sim 1.7$, by assuming that the physical processes leading to the $��N\!N$ final states are analogous to those of $��pn$., 13 pages, 12 figures

Published
2020
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37. Precision spectroscopy of Kaonic Helium 3 d → 2 p X-rays

Author

Okada, S., Beer, G., Bhang, H., Cargnelli, M., Chiba, J., Choi, S., Curceanu, C., Fukuda, Y., Hanaki, T., Hayano, R.S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwasaki, M., Juhász, B., Kienle, P., Marton, J., Matsuda, Y., Ohnishi, H., Outa, H., Sato, M., Schmid, P., Suzuki, S., Suzuki, T., Tatsuno, H., Tomono, D., Widmann, E., Yamazaki, T., Yim, H., and Zmeskal, J.

Published
2007
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38. “K−pp”, a [formula omitted]-meson nuclear bound state, observed in 3He(K−,Λp)n reactions

Author

Ajimura, S., Asano, H., Beer, G., Berucci, C., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R.S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Vazquez Doce, O., Widmann, E., Yamaga, T., Yamazaki, T., Zhang, Q., and Zmeskal, J.

Published
2019
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39. Kaonic Atom Experiments at J-PARC

Author

Hashimoto, T., primary, Aikawa, S., additional, Ajimura, S., additional, Akaishi, T., additional, Asano, H., additional, Bazzi, M., additional, Beer, G., additional, Bennett, D., additional, Berucci, C., additional, Bosnar, D., additional, Bragadireanu, M., additional, Bhler, P., additional, Busso, L., additional, Butt, A. D., additional, Cargnelli, M., additional, Choi, Seonho, additional, Curceanu, C., additional, Doriese, W. B., additional, Durkin, M. S., additional, Enomoto, S., additional, Ezoe, Y., additional, Fowler, J. W., additional, Fujioka, H., additional, Fukuda, T., additional, Guaraldo, C., additional, Gustafsson, F. P., additional, Han, C., additional, Hayakawa, R., additional, Hayano, R. S., additional, Hayashi, T., additional, Hays-Wehle, J. P., additional, Hilton, G. C., additional, Hiraiwa, T., additional, Ichinohe, Y., additional, Iio, M., additional, Iizawa, Y., additional, Iliescu, M., additional, Inoue, K., additional, Ishimoto, S., additional, Ishisaki, Y., additional, Itahashi, K., additional, Iwasaki, M., additional, Kawasaki, S., additional, Ma, Y., additional, Marton, J., additional, Matsuda, Y., additional, Mizoi, Y., additional, Morra, O., additional, Murakami, T., additional, Nagae, T., additional, Nishi, T., additional, Noda, H., additional, Noumi, H., additional, Nunomura, K., additional, O’Neil, G. C., additional, Ohashi, T., additional, Ohnishi, H., additional, Okada, S., additional, Outa, H., additional, Piscicchia, K., additional, Reintsema, C. D., additional, Sada, Y., additional, Sakaguchi, A., additional, Sakuma, F., additional, Sato, M., additional, Schmidt, D. R., additional, Scordo, A., additional, Sekimoto, M., additional, Shi, H., additional, Shirotori, K., additional, Sirghi, D., additional, Sirghi, F., additional, Suzuki, K., additional, Suzuki, S., additional, Suzuki, T., additional, Swetz, D. S., additional, Takamine, A., additional, Tanida, K., additional, Tatsuno, H., additional, Tomono, D., additional, Toyoda, A., additional, Trippl, C., additional, Tsukada, K., additional, Uhlig, J., additional, Ullom, J. N., additional, Vazquez Doce, O., additional, Widmann, E., additional, Yamada, S., additional, Yamaga, T., additional, Yamazaki, T., additional, and Zmeskal, J., additional

Published
2019
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40. ' ', a -meson Nuclear Bound State, Observed in He( ,λ ) Reactions

Author

Ajimura, S., Asano, H., Beer, G., Berucci, C., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R.S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Vazquez Doce, O., Widmann, E., Yamaga, T., Yamazaki, T., Zhang, Q., and Zmeskal, J.

Abstract

We observed a distinct peak in the Λp invariant mass spectrum of He3(K−,Λp)n, well below mK+2mp, i.e., the mass threshold of the K− to be bound to two protons. By selecting a relatively large momentum-transfer region q=350∼650 MeV/c, one can kinematically separate the peak from the quasi-free process, K‾N→K‾N followed by the non-resonant absorption by the two spectator-nucleons K‾NN→ΛN. We found that the simplest fit to the observed peak gives us a Breit–Wigner pole position at BKpp=47±3(stat.)−6+3(sys.) MeV having a width ΓKpp=115±7(stat.)−20+10(sys.) MeV, and the S-wave Gaussian reaction form-factor parameter QKpp=381±14(stat.)−0+57(sys.) MeV/c, as a new form of the nuclear bound system with strangeness – “K−pp”.

Published
2019

41. A search for the K−pp bound state in the 3He(K−in-flight, n) reaction at J-PARC

Author

Hashimoto T., Ajimura S., Beer G., Bhang H., Bragadireanu M., Buehler P., Busso L., Cargnelli M., Choi S., Curceanu C., Enomoto S., Faso D., Fujioka H., Fujiwara Y., Fukuda T., Guaraldo C., Hayano R. S., Hiraiwa T., Iio M., Iliescu M., Inoue K., Ishiguro Y., Ishikawa T., Ishimoto S., Ishiwatari T., Itahashi K., Iwai M., Iwasaki M., Kato Y., Kawasaki S., Kienle P., Kou H., Ma Y., Marton J., Matsuda Y., Mizoi Y., Morra O., Nagae T., Noumi H., Ohnishi H., Okada S., Outa H., Piscicchia K., Poli Lener M., Romero Vida A., Sada Y., Sakaguchi A., Sakuma F., Sato M., Scordo A., Sekimoto M., Shi H., Sirghi D., Sirghi F., Suzuki K., Suzuki S., Suzuki T., Tanida K., Tatsuno H., Tokuda M., Tomono D., Toyoda A., Tsukada K., Vazquez Doce O., Widmann E., Wuenschek B. K., Yamaga T., Yamazaki T., Yim H., Zhang Q., and Zmeska J.

Subjects
Physics, QC1-999
Abstract

We have collected the first physics data of an experimental search for the simplest kaonic nuclear bound state, “K− pp”, by the 3He(K− n) reaction at J-PARC. We confirmed that our spectrometer system works as designed and observed clear peak structure composed of the quasi-elastic K−“n” → K−n and the charge-exchange K−“p” → ¯̅K0n reactions in the forward neutron spectrum.

Published
2014
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42. Search for the K−pp bound state via the in-flight 3He(K−, n) reaction

Author

Sada Y., Ajimura S., Beer G., Bhang H., Bragadireanu M., Buehler P., Busso L., Cargnelli M., Choi S., Curceanu C., Enomoto S., Faso D., Fujioka H., Fujiwara Y., Fukuda T., Guaraldo C., Hashimoto T., Hayano R. S., Hiraiwa T., Iio M., Iliescu M., Inoue K., Ishiguro Y., Ishikawa T., Ishimoto S., Ishiwatari T., Itahashi K., Iwai M., Iwasaki M., Kato Y., Kawasaki S., Kienle P., Kou H., Ma Y., Marton J., Matsuda Y., Mizoi Y., Morra O., Nagae T., Noumi H., Ohnishi H., Okada S., Outa H., Piscicchia K., Poli Lener M., Romero Vidal A., Sakaguchi A., Sakuma F., Sato M., Scordo A., Sekimoto M., Shi H., Sirghi D., Sirghi F., Suzuki K., Suzuki S., Suzuki T., Tanida K., Tatsuno H., Tokuda M., Tomono D., Toyoda A., Tsukada K., Vazquez Doce O., Widmann E., Weunschek B. K., Yamaga T., Yamazaki T., Yim H., Zhang Q., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

In the J-PARC E15 experiment, a K− pp search was performed via the 3He(K−, n) reaction at 1.0 GeV/c. A forward-going neutron is detected by a neutron counter with 15 m flight length, and decay particles from K− pp are simultaneously measured by a cylindrical detector system that surrounds a liquid 3He target system. In March and May, 2013, we carried out the first physics data-taking with 5×109 incident kaons on the 3He target, and we have obtained a preliminary exclusive analysis result of 3He(K−, Λp)n reaction.

Published
2014
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44. '$\mathbf{{\textit K^-}{\textit p}{\textit p}}$', a ${\overline{K}}$-Meson Nuclear Bound State, Observed in $^{3}{\rm He}({K^-}, �� p)n$ Reactions

Author

PARC E15 Collaboration, Ajimura, S., Asano, H., Beer, G., Berucci, C., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamaga, T., Yamazaki, T., Zhang, Q., and Zmeskal, J.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

We observed a distinct peak in the $��p$ invariant mass spectrum of $^{3}{\rm He}(K^-, \, ��p)n$, well below the mass threshold of $m_K + 2 m_p$. By selecting a relatively large momentum-transfer region $q = 350 \sim 650$ MeV/$c$, one can clearly separate the peak from the quasi-free process, $\overline{K}N \rightarrow \overline{K}N$ followed by the non-resonant absorption by the two spectator-nucleons $\overline{K}NN \rightarrow ��N $. We found that the simplest fit to the observed peak gives us a Breit-Wigner pole position at $B_{\rm {\it Kpp}} = 47 \pm 3 \, (stat.) \,^{+3}_{-6} \,(sys.)$ MeV having a width $��_{\rm {\it Kpp}} = 115 \pm 7 \, (stat.) \,^{+10}_{-9} \,(sys.)$ MeV, and the $S$-wave Gaussian reaction form-factor parameter $Q_{\rm {\it Kpp}} = 381 \pm 14 \, (stat.)\,^{+57}_{-0} \,(sys.)$ MeV/$c$, as a new form of the nuclear bound system with strangeness -- "$K^-pp$"., 17 pages, 4 figures

Published
2018
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46. “K−pp”, a K‾-meson nuclear bound state, observed in 3He(K−,Λp)n reactions

Author

Ajimura, S., primary, Asano, H., additional, Beer, G., additional, Berucci, C., additional, Bhang, H., additional, Bragadireanu, M., additional, Buehler, P., additional, Busso, L., additional, Cargnelli, M., additional, Choi, S., additional, Curceanu, C., additional, Enomoto, S., additional, Fujioka, H., additional, Fujiwara, Y., additional, Fukuda, T., additional, Guaraldo, C., additional, Hashimoto, T., additional, Hayano, R.S., additional, Hiraiwa, T., additional, Iio, M., additional, Iliescu, M., additional, Inoue, K., additional, Ishiguro, Y., additional, Ishikawa, T., additional, Ishimoto, S., additional, Itahashi, K., additional, Iwasaki, M., additional, Kanno, K., additional, Kato, K., additional, Kato, Y., additional, Kawasaki, S., additional, Kienle, P., additional, Kou, H., additional, Ma, Y., additional, Marton, J., additional, Matsuda, Y., additional, Mizoi, Y., additional, Morra, O., additional, Nagae, T., additional, Noumi, H., additional, Ohnishi, H., additional, Okada, S., additional, Outa, H., additional, Piscicchia, K., additional, Sada, Y., additional, Sakaguchi, A., additional, Sakuma, F., additional, Sato, M., additional, Scordo, A., additional, Sekimoto, M., additional, Shi, H., additional, Shirotori, K., additional, Sirghi, D., additional, Sirghi, F., additional, Suzuki, K., additional, Suzuki, S., additional, Suzuki, T., additional, Tanida, K., additional, Tatsuno, H., additional, Tokuda, M., additional, Tomono, D., additional, Toyoda, A., additional, Tsukada, K., additional, Vazquez Doce, O., additional, Widmann, E., additional, Yamaga, T., additional, Yamazaki, T., additional, Zhang, Q., additional, and Zmeskal, J., additional

Published
2019
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47. Spectroscopic study of the Λ(1405) resonance via the d(K−, n) reaction at J-PARC

Author

Asano, H., primary, Aikawa, S., additional, Ajimura, S., additional, Akaishi, T., additional, Beer, G., additional, Berucci, C., additional, Bragadireanu, M., additional, Buehler, P., additional, Busso, L., additional, Cargnelli, M., additional, Choi, S., additional, Curceanu, C., additional, Enomoto, S., additional, Fujioka, H., additional, Fujiwara, Y., additional, Fukuda, T., additional, Guaraldo, C., additional, Hashimoto, T., additional, Hayano, R. S., additional, Hiraiwa, T., additional, Iio, M., additional, Iliescu, M., additional, Inoue, K., additional, Ishiguro, Y., additional, Ishikawa, T., additional, Ishimoto, S., additional, Itahashi, K., additional, Iwai, M., additional, Iwasaki, M., additional, Kanno, K., additional, Kato, K., additional, Kato, Y., additional, Kawasaki, S., additional, Kienle, P., additional, Komatsu, Y., additional, Kou, H., additional, Ma, Y., additional, Marton, J., additional, Matsuda, Y., additional, Mizoi, Y., additional, Morra, O., additional, Nagae, T., additional, Noumi, H., additional, Ohnishi, H., additional, Okada, S., additional, Omar, Z., additional, Outa, H., additional, Piscicchia, K., additional, Sada, Y., additional, Sakaguchi, A., additional, Sakuma, F., additional, Sato, M., additional, Scordo, A., additional, Sekimoto, M., additional, Shi, H., additional, Shirotori, K., additional, Sirghi, D., additional, Sirghi, F., additional, Suzuki, K., additional, Suzuki, S., additional, Suzuki, T., additional, Tanida, K., additional, Tatsuno, H., additional, Tokiyasu, A. O., additional, Tokuda, M., additional, Tomono, D., additional, Toyoda, A., additional, Tsukada, K., additional, Doce, O. Vazquez, additional, Widmann, E., additional, Yamaga, T., additional, Yamazaki, T., additional, Yim, H., additional, Zhang, Q., additional, and Zmeskal, J., additional

Published
2019
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48. Precision Spectroscopy of Kaonic Helium-3 Atoms X-rays at J-PARC

Author

Tanida K., Suzuki T., Sirghi F., Sirghi D., Shi H., Sekimoto M., Sato M., Sakuma F., Outa H., Okada S., Ohnishi H., Noumi H., Matsuda Y., Marton J., Kienle P., Kou H., Iwasaki M., Itahashi K., Ishiwatari T., Ishimoto S., Hiraiwa T., Hayano R.S., Hashimoto T., Guaraldo C., Fujiwara Y., Fujioka H., Enomoto S., Doce O.V., Curceanu C., Choi S., Cargnelli M., Bhang H., Iio M., Tatsuno H., Tokuda M., Tomono D., Toyoda A., Tsukada K., Vidal A.R., Widmann E., Wunschek B., Yamazaki T., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

We will measure the Balmer-series x-rays of kaonic-3He atoms using large-area high-resolution silicon drift x-rays detectors in order to provide the crucial information of K−-nucleus strong interaction at the low energy limit. The strong interaction 2p level shift will be determined with a precision of a few eV. At the present status, the construction of all detectors is in progress. In February, 2009, the first tuning of K1.8BR beamline was performed by the secondary beam generated in J-PARC hadron facility. The data taking will be started soon.

Published
2010
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49. A search for deeply-bound kaonic nuclear states at J-PARC

Author

Sakaguchi A., Sada Y., Pietreanu D., Outa H., Okada S., Ohnishi H., Noumi H., Nagae T., Morra O., Mizoi Y., Matsuda Y., Marton J., Kienle P., Kou H., Iwasaki M., Iwai M., Itahashi K., Ishiwatari T., Ishimoto S., Ishikawa T., Inoue K., Iliescu M., Iio M., Hiraiwa T., Hayano R.S., Hashimoto T., Guaraldo C., Fukuda Y., Fukuda T., Fujiwara Y., Faso D., Fujioka H., Enomoto S., Curceanu C., Choi S., Cargnelli M., Busso L., Buehler P., Bragadireanu M., Bhang H., Beer G., Ajimura S., Sakuma F., Sato M., Sekimoto M., Sirghi D., Sirghi F., Suzuki K., Suzuki S., Suzuki T., Tatsuno H., Tokuda M., Tomono D., Toyoda A., Tsukada K., Widmann E., Yamazaki T., Yim H., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

The J-PARC E15 experiment will be performed to search for the simplest kaonic nuclear bound state, K− pp, by the in-flight 3He(K−,n) reaction. The exclusive measurement can be performed by a simultaneous measurement of the missing mass using the primary neutron and the invariant mass via the expected decay, K− pp → Λp → pπ− p. In this report, an overview of the experiment and the preparation status are presented.

Published
2010
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